Shafira Devayanti, Machsus Machsus, Mohamad Khoiri

Evaluation of Effectiveness and Benefits of iRAP and Bina Marga Methods for Road Safety Assessment on the Karanglo-Bts. Kota Batu (Karang Ploso) Segment

Introduction

Evaluation of effectiveness and benefits of irap and bina marga methods for road safety assessment on the karanglo-bts. Kota batu (karang ploso) segment. Evaluate iRAP & Bina Marga methods for road safety assessment on Karanglo-Batu segment. Both effective, improving scores to 4 stars after rehabilitation. iRAP shows higher benefits & precision.

Abstract

According to Road Safety (2002), traffic accidents result from vehicles, humans, road environments, and their interactions. Addressing these issues is crucial for improving road safety, particularly for operational roads and those under maintenance, to prevent recurring accidents in the same locations. This study examines the effectiveness and benefits of two road safety assessment methods: the iRAP ranking analysis method and the Bina Marga ranking analysis method. The Karanglo–Batu City Border (Karang Ploso) road segment, spanning 7.99 km, was selected as the study area. Both methods analyze five key accident types: roadway departure, head-on collisions due to loss of control or overtaking, intersection accidents, and accidents at property access points. Factors influencing these accidents include probability, severity, operational speed, external traffic, and median traversability, with star ratings assigned based on the Star Rating Score (SRS). The iRAP method, utilizing the iRAP Demonstrator application, yielded an SRS score of 8.92 (3 stars), while the Bina Marga method, using manual calculations as per the Road Environment and Safety Guidelines Number 06/P/BM/2024, produced a score of 7.13 (3 stars). After implementing rehabilitation recommendations, both methods improved the score to 2.78 (4 stars). Effectiveness values were 35.68 for iRAP and 31.69 for Bina Marga, both categorized as effective. Post-improvement, the effectiveness value was 12.36, categorized as very effective. The iRAP method demonstrated higher direct benefits, particularly in data input, sampling, and implementation, making it more suitable for precise safety assessments.

Review

The paper addresses a critical issue in traffic engineering: improving road safety and preventing recurrent accidents, particularly on operational and maintained road segments. By focusing on the Karanglo–Batu City Border (Karang Ploso) segment, the study undertakes a comparative evaluation of two prominent road safety assessment methodologies: the international iRAP ranking analysis and the local Bina Marga ranking analysis. This objective is highly relevant given the significant societal and economic costs associated with traffic accidents, aiming to identify the most effective tool for proactive safety improvements. The study meticulously applies both iRAP and Bina Marga methods to analyze common accident types, including roadway departure, head-on collisions, and intersection accidents, considering factors like probability, severity, and operational speed. Initially, both methods yielded a 3-star rating for the segment, with iRAP scoring 8.92 SRS and Bina Marga 7.13 SRS. Crucially, the research then models the impact of rehabilitation recommendations, demonstrating a significant improvement to a 4-star rating (SRS 2.78) across both assessments. The calculated effectiveness values further support the utility of both methods, categorized as "effective" initially and "very effective" post-improvement, highlighting their potential for guiding safety interventions. A key strength of this research lies in its direct comparison of two distinct assessment frameworks, providing practical insights for practitioners and policymakers. The findings clearly indicate that while both methods are effective in identifying safety issues and potential improvements, the iRAP method offers higher direct benefits, particularly in terms of data handling, sampling efficiency, and overall implementation. This suggests iRAP's potential as a more suitable and precise tool for comprehensive safety assessments in the Indonesian context. The study successfully demonstrates how systematic evaluation can inform evidence-based road safety interventions, ultimately contributing to safer road environments and accident reduction.

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